In a manner that shows grudge, resentment, or unwillingness; with ill will or reluctance.
From 'grudge' (from Old French 'grouchier,' meaning to grumble, with unclear ultimate origins) plus '-full' (adjective suffix meaning full of) plus '-ly' (adverb suffix).
This word captures the emotional undertone of doing something you resent—it's the difference between paying a bill (reluctantly) and paying grudgefully (implying you secretly despise the person receiving it).
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